Gross structure of the human gas exchange system: alveoli, bronchioles, bronchi, trachea and lungs
The human gas exchange system moves air from your mouth and nose down into your lungs. It branches from one large tube into millions of tiny air sacs where oxygen enters your blood.
Real World
When a smoker develops chronic bronchitis, the goblet cells lining the bronchi overproduce mucus, narrowing the airway — a direct consequence of damage to the very structures listed in this topic.
Exam Focus
Learn the correct order: trachea → bronchi → bronchioles → alveoli; reversing the sequence is a common error that loses easy marks.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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